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There might be good reasons why the getting a clock failed. To treat the clocks as optional we're specifically only interested in ignoring -ENOENT, and devm_clk_get_optional() does just that. Note that this preserves the original behavior of all clocks being optional. The binding document mandates the "bus" clock while the dove machine only specifies "core". Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>